Mission impossible: Dr Robert Goddard was mocked for using a blackboard at Clark University in Worcester, Massachusetts, in 1924, to describe how man flying to the Moon would one day be possible

1924年，当罗伯特·戈达德博士在马萨诸塞州伍斯特市克拉克大学的黑板上演示将来如何把地球人送上月球时，他被嘲笑成是痴人说梦

youdao

Using the traditional way of blackboard and billboards posted there has obviously deficiencies.

采用传统的黑板和宣传栏张贴的方式存在明显的不足。

youdao

Using multi-media projector and writing on the blackboard.

采用多媒体投影结合板书教学；

youdao

I've been using the blackboard a little ad hoc here, but suppose I neaten things up here now and present this rectangle is let's say R RAM, the memory inside of your computer.

我在这里特别地使用这块黑板，假如我整理这些东西，把它们呈现,这个长方形，假如说就是内存，你电脑的内存。

哈佛公开课 - 计算机科学课程节选

For the next six hours, the instructor, using the computer screen as blackboard, teaches the customer service representatives everything from handling angry callers to enrolling new members.

FORBES: Good morning, HAL